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146:"pitch bowl" for smaller ones. The bowl, typically 6 to 20 cm in diameter, can be placed over a sand bag or leather ring, and tilted to whatever angle is most convenient. Its weight (3–4 kg when filled) will keep it firm enough for most jewelry work.
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Generally, chaser's pitch must become soft or even liquid when heated at moderate temperatures, in order to fit the object and fill all its nooks and crannies. For many uses, it is desirable that the pitch is soft like
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while it is still cool enough to be molded with the fingers. On the other hand, at room temperature it must be hard enough to hold the object. It must strongly adhere to the metal while it is cooling.
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For deep repoussé or chasing works, the pitch is usually applied as a thick layer on top of some backing material that can accommodate larger deformations.
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as used by plumbers may also be used, although it creates a fire hazard since the pitch (and any vapors it may release when hot) are flammable.
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For repoussé or other metalworking, the pitch is usually poured or pressed while hot into a "pitch tray" for larger pieces, or in a heavy
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There are many varieties of chaser's pitch available, that differ on the nature or the ingredients, physical properties (such as
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The pitch is heated until molten. Plaster of Paris is added a small amount at a time. Resin and tallow are then mixed in.
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165:. A blow torch can also be used to burn the residues, if the object can withstand the temperature.
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is a preferred way to heat up the pitch (and, if necessary, the metal object). A powerful
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Chaser's pitch has indefinite shelf life and can be re-melted and re-used indefinitely.
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Pitch residues stuck to the object can be removed with an appropriate
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189:" proper, that provides the basic adherence and fusibility;
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Thermal setting adhesive used by metalwork artisans
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54:(embossing) while it is being hammered out.
181:Chaser's pitch is usually a combination of
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289:
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18:
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74:), or place of origin. Names include
50:artisans to hold a metal plate for
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298:Jewelry Concepts & Technology
135:Pitch bowls holding work pieces
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126:
1:
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192:a "filler", such as powdered
274:while grinding or polishing.
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235:A typical recipe could be:
215:The pitch can be a form of
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355:
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242:20 parts plaster of Paris
223:, or can be derived from
301:. Doubleday; 864 pages.
52:repoussage and "chasing"
324:Visual arts terminology
211:, that makes it softer.
295:Oppi Untracht (2011):
200:, to improve firmness;
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24:
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334:Sculpture techniques
96:black chaser's pitch
92:green chaser's pitch
209:Venetian turpentine
119:could also work. A
227:of various trees.
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48:metal cold-working
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329:Jewellery making
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198:plaster of Paris
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268:Dopping cement
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239:16 parts pitch
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28:Chaser's pitch
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307:9780307784117
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76:Swedish pitch
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30:is a thermal
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88:German pitch
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46:, and other
44:coppersmiths
40:silversmiths
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177:Composition
127:Receptacles
318:Categories
279:References
207:, such as
163:turpentine
161:, such as
121:blow torch
117:hair dryer
68:fusibility
36:goldsmiths
272:gemstones
221:petroleum
205:emollient
169:Recycling
144:cast iron
23:Red pitch
262:See also
245:4 parts
113:heat gun
102:Handling
72:hardness
34:used by
32:adhesive
251:1 part
231:Recipes
217:asphalt
159:solvent
153:Cleanup
107:Heating
94:, and
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253:tallow
225:resins
194:pumice
247:resin
187:pitch
84:Brown
303:ISBN
82:(or
70:and
203:an
196:or
185:a "
80:Red
320::
286:^
111:A
98:.
90:,
86:)
78:,
42:,
38:,
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